~I\.J '. 'L

CollinsKWM-380owner's manual

523-0769877-0022172nd Edition, 1 January 1981

owner's manual

Collins KWM-380Transceiver

Collins TelecommunicationsProducts Division

Electronic Systems GroupRockwell International

Cedar Rapids, Iowa, 52406Printed in the United Stetes of Americe

introduction

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TPA~ 1569-017

This manual contains operating and installation information forthe fully synthesized, all solid-state KWM-380 Transceiver. Fullcoverage from 1.80000 to 29.99999 MHz is standard in thereceiver circuits. Transmission is limited to 1.800 to 1.999,3.250 to 4.249, 6.750 to 7.549, 10.100 to 10.149, 13.750 to14.599, 18.060 to 18.169, 20.750 to 21.699, 24.890 to 24.989,and 28.000 to 29.699-MHz about the Amateur Radio Servicebands. For earlier manufactured KWM-380's not programmedfor expanded frequency coverage, Service Bulletin No 10 forthe KWM-380 is available to enable transmission on these fre-quencies. A pll synthesizer tunes in 10-Hz increments eithermanually or with an optional remote keypad control. Split vfo isstandard, as is the digital frequency display driven directly bythe microprocessor.

Because of the uniqueness of each individual station, the instal-lation information found here is limited in scope. In-depth infor-mation can be found in numerous publications commonlyreferred to by amateur radio operators.

Test 'procedures in this manual require only simple test equip-ment to perform. The procedures are a guide in tracing mal-functions to a functionally related group of circuit cards.Detailed tests requiring laboratory-type test equipment andschematic diagrams are included in the KWM-380 TransceiverService Manual, Collins publication number 523-0769878,available through Rockwell-Collins Amateur Products Distribu-tor /Service Agencies.

1

specifications

Physical

Size 394 mm (15.5 in) wide, 165mm (6.5 in) high, (does notinclude 25 mm (1 in) feetnormally attached), 457 mm(18.0 in) deep

Weight 21.8 kg (48 Ibs) max

Primary power Strappable for: 105, 115, 125/210, 220, 230, 240, 250 V::1:5%,50 to 60 Hz; or 12 to 15V de. 120 W max in receive;600 W max in transmit

Receiver

Frequency 1.6 to 29.99999 MHz, tunablein 10-Hz steps

Modes USB, LSB, AM, and CW

Sensitivity (at antennaterminals) 0.5 p.Vor better for 10 dB

(s+n)/n, 2.0 to 30.0 MHz; 1.0p.Vor better 1.8 to 2.0 MHz

Selectivity (3-dB minbandwidth) Selectable

8 kHz*6 kHz2.1 kHz

*1.7 kHz*360 Hz*140 Hz

If and image rejection Greater than 60 dB

*Optional filters

2

Intermodulation distortion -50 dB or better for twosignals of -10 dB mW each,20 kHz apart

AGC Audio output variation notmore than 8 dB for 4-ILVto200-mV open circuit rf inputvariation

Audio output Not less than 3.5 W into 4-ohm load, at 1 kHz, at notmore than 10% total harmonicdistortion

Line audio output: -10 dB mWnominal into 600 ohms

Frequency response: 300 to2400 Hz with not more than 5dB variation

Transmitter

Frequency (Completecoverage shown mayrequire installation ofKWM-380 ServiceBulletin No 10) 160- through 10-m amateur

bands, tunable in 10-Hz steps

160 m80/75 m

**30 m**17 m**12 m

40 m20 m15 m10 m

**Future amateur bands

1.800- 1.999 MHz3.500- 4.000 MHz

10.100-10.149 MHz18.068-18.169 MHz24.890-24.989 MHz

7.000- 7.300 MHz14.000-14.350 MHz21.000-21.450 MHz28.000-29.699 MHz

3

MARS f:250 kHz eitherside of 80 - 15 mbands, except 30m and 17 mbands

Modes USB, LSB, and CW

Output power 100 W pep, nominal

In CW or RTTY, automaticturndown to 50 W after 10seconds, 50 percent dutycycle, key down 15 minutes,max.

With optional blower kitinstalled, power is 100 Wcontinuous; key down 1 hour,max, at 25°C; 30 minutes,max, at 50 °C for all modes.

Unwanted signalsuppression

Carrier -50 dB or better

Undesired sideband,1-kHz ref -55 dB or better

Harmonics (all) -40 dB or better

Mixer products -50 dB or better

Third order distortion 25 dB below each tone oftwo-tone test

Synthesizer accuracyand stability Accuracy within f:5 Hz after

10 minutes warm-up when39.6- and 0.455-MHzoscillators are set to withinf:3 Hz

4

Stability within :1:150 Hz overtemperature range of 0 to 50°c

Rf load 50 ohms, nonreactive. Fullpower output with vswr of 2:1or less. Automatic poweroutput turndown with vswrgreater than 2:1.

Audio inputs

Microphone Low or high impedance,dynamic

Line 600 ohm, unbalanced; 40-mVinput sufficient for full rfpower output

5

INSTAllATION

unpacking

The KWM-380 may be shipped in two separate cartons,depending on the shipping carrier's requirements. One con-tains the power transformer, the other contains the transceiver.After carefully unpacking the cartons, check to be sure no ship-ping damage is evident. Should any damage be apparent, savethe cartons and notify the delivery carrier immediately to fileclaim for damage.

The KWM-380 is shipped strapped for 115 V ac operation.

power transformer installation

If the power transformer has been shipped separately, it can bequickly installed in five steps. A 3/8-in open-end wrench, no 12(3/8-in) nutdriver, and a Phillips screwdriver are the only toolsneeded.

· Using the screwdriver, remove four screws from the bottomof the transceiver (near the rubber feet at each corner) andslide the dust cover off over the heat sink.

· Remove the front one of the two Phillips-head screws secur-ing the front panel braces to the sides of the chassis and tiltthe panel forward.

· Turn the transformer so terminals 1 through 8 face the frontpanel. With the nutdriver, re_movethe four hexposts andlockwashers from the chassis mounting studs in the rightfront corner of the chassis and set the transformer over thestuds.

· Using the wrench and nutdriver, secure the transformer tothe studs with the four lockwashers and hexposts.

· Electrically connect the transformer to the transceiver withthe two attached polarized connectors. Reattach the frontpanel, then replace the dust cover. Be careful when replac-ing the dust cover to avoid pinching or dislodging cables.

6

Figure 1 shows the transformer properly mounted.

REMOVE THIS SCREW fROM EACHSIDE TO TIP FRONT PANELDOWNWARD.

TPA-1655-011

Power Transformer InstallationFigure 1

primary power requirements

WARNING

I DO NOT ATTEMPT TO CHANGE VOLTAGE _

I~ STRAPPINGWHILE PRIMARYPOWERISI APPLIED. ELECTRICAL SHOCK WILL OC-

CUR. DISCONNECT THE PRIMARY POWERCABLE FROM THE POWER SOURCE ORTHE UNIT FIRS'l._ __ __ I

ac voltage operation

The KWM-380 will operate from various 50- to 60-Hz voltages,depending on internal strapping connections. As shipped fromthe factory, the KWM-380 is strapped for 115 V operation.

7

.

For input voltages listed, refer to figure 2 and strap TB1 asfollows:

Determine the average ac voltage at the primary power outletwhere the transceiver is to be used. Remove the chassis dustcover and locate the protective cover plate near the left rearcorner as viewed with chassis upside down. Remove the coverplate and refer to the preceding chart to make the connectionsindicated for the voltage nearest the primary power outlet volt-age. If the outlet voltage is approximately halfway between twovoltages listed, strap TB1 for the lower voltage.

Figure 2 shows TB1 correctly strapped for 105 or 240 volts.

BLACKVIOLET

STRAPPING FOR 105 V AC STRAPPING FOR 240 V AC

BOTTOM LEFT REAR CORNER OF TRANSCEIVER TPA. 1653-0 II

TB1 Strapping for 105 Volts or 240 VoltsFigure 2

8

WIRE 105 115 125 210 220 230 240 250

BLACK 7 7 7 6 6 5 5 4

YELLOW 3 2 1 3 2 2 1 1

RED 6 5 4 3 2 2 1 1

de voltage operation

The KWM-380 will also accept 12 to 15 volts dc for backupemergency power. The primary power connector must bestrapped as shown in figure 3. Power requirements are nomi-nally 3 A in receive and 20 A in transmit.

REAR (WIRING SIDE) VIEW OF CABLE CONNECTOR

AC H~GHSAFETY GROUNDAC NEUTRAL

IIo 12

c:::J

_

]13.5+ V DC

AC CONNECTOR

(JUMPER)

DC CONNECTOR

TPA-1654-0 II

Power Connector Strapping for AC or DC OperationFigure 3

operating location

The normal operating location should be chosen so the trans-ceiver is away from heat vents and normal airflow around-it isunobstructed. Do not lay objects on top or against the sides. Itis especially important that the heat sink have a free flow of airabout it. An automatic turndown circuit will reduce the rf outputpower if the heat sink overheats. This is for self-protection ofthe power amplifier output stages.

The AC-2808 Blower Kit is available for attaching to the heatsink. This blower supplies cooling air to permit normal opera-tion in close quarters or high-duty cycle operation.

9

system interconnections

Figures 4 and 5 show typical hookups. Table 1 lists the signalparameters for all front and rear connectors except the primaryand rf power.

For phone patch interconnections, 600-0 audio input (J2), ptt(J9), and 4-8-0 speaker output (J10) connectors are availableon the KWM-380 rear panel. Refer to the phone patch manu-facturer's instructions for interconnect information.

115 OR220 VAC

TO50 nANTENNA

KWM- 380 TRANSCEIVER (REAR)

EXTERNALEARTHGROUNDINGSYSTEM TPA-1651-011

Transceiver Installation Connections

Figure 4

3OL-1 LINEAR AMPLIFIER (REAR)

TOANTENNA

TRANSCEIVER (REAR)

TO 115 OR220 VAC

TPA-1652-01'.

Transceiver and Linear Power Amplifier Installation ConnectionsFigure 5

10

Table 1. Controls. Indicators, Connectors. and Signal Parameters.

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ITEM FUNCTION

METER (switch) Selects signal applied to meter during transmit.

ALC Transmitter automatic level control voltage. Do notexceed S9 alc level in transmit.

VC Collector voltage for final amplifier stage.

PF Forward rf power sampled at amplifier output.

PR Reflected rf power sampled at amplifier output.

Meter In receive. Indicates relative signal strength In 'S'units. (Rf Input of 100 IlV at antenna terminalsgives S9 indication.) In transmit. indicates signalselected by METER switch.

Function switches Selects related function when switch is in position.

MOX Manually operated receive-to-transmit switching.Places transceiver in transmit when pressed in.

VOX Voice operated recelve-to-transmit switching. pttswitching also operable.

NB Noise blanker.

PROC Speech processor.

AGC Receiver automatic control. (Switch must be In inposition to enable AGC function.)

SLOW Selects slow AGC action In in position; fast AGCwhen out. (AGC switch must be In in position forfast/slow action to be enabled).

DELAY Adjustments for transmlt-to-recelve switching timedelay.

CW Delay between last key-up action and receivemode.

SSB Delay between last microphone VOX Input and re-ceive mode.

Table 1. Controls, Indicators, Connectors, and Signal Parameters (Cont).

12

ITEM FUNCTION

GAIN Adjusts levels at which receive-to-transmit switchingoccurs.

VOX Voice or line audio input signals.

ANTI Speaker-to-microphone signals.

Frequency readout Displays frequency in 10-Hz increments.

Frequency control Selects frequency increments affected by tuningswitches knob. Continuous tuning for any increment with

roll-around at end limits.

--, 1-MHz increments.

SYNC Loads displayed frequency in nonselected vfo reg-ister to synchronize both vfo frequencies.

LOCK Dial lock prevents tuning knob from changing fre-quency when rotated. Release by pressing in anyincrement switch.

I 1-kHz increments.

r(left) 100-Hz increments.

r(right) 10-Hz increments.

POWER Primary power switch.

Tuning knob Frequency selection control, (Provides 200 incre-ments per revolution for all except MHz steps at 10increments per revolution.) Works in conjunctionwith switches above knob.

SPOT In CW mode only, enables 800-Hz tone to whichreceived CW tone is matched to spot transmittedfrequency to exact received frequency.

VFO Selects frequency-storage register.

A A register. Transmit and receive on same fre-quency.

Table 1. Confrols, Indicators, Connectors, and Signal Parameters (Cont).

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ITEM FUNCTION

B B register. Transmit and receive on same fre-quency.

RA-TB Receive on A register frequency-transmit on B reg-ister frequency.

RB-TA Receive on B register frequency-transmit on A reg-ister frequency.

SELECTIVITY Controls selectivity of receiver.

PBT (small Passband tuning. Used to select USB, LSB, or CWknob) during receive mode. Continuously varies position

of passband (bandwidth selected by BW control)within 8-kHz passband of first if filter.

BW (large knob) Selects filter bandwidth.

8.0 8.0-kHz filter (for AM, also selects optional 6-kHzAM filter if installed).

2.2 2.2-kHz filter (for normal SSB).

OPT 1,2,3 Three positions for optional filters

MODE Selects mode of transmit operation.

CW Continuous wave.

USB

Uppe' .debond. }Receive sideband determined bysetting of PBT control.

LSB Lower sideband.

AM RCV Amplitude modulat!on in receive only. Transmitterdoes not operate in AM mode.

GAIN Adjusts gain of receiver circuits.

AF (small knob) Af amplifier gain.

RF (large knob) Rf amplifier gain.

..

Table 1. Controls, Indicators, Connectors, and Signal Parameters (Cont).

14

ITEM FUNCTION

MIC/CARRIER In sideband operation adjusts microphone amplifiergain. In CW operation adjusts rf carrier level. Donot exceed S9 alc indication.

PHONES (mates Output jack for low-impedance (4-to 8-0) head-with PJ-055) phones. Connecting phones inhibits speakr and

SPKR (on rear panel) outputs.Tip-receiver audio; 4- to 8-0 impedance, up to

3-W outputBarrel-ground

MIC (mates with Input jack for high- or low-impedance, dynamicPJ-068) microphone. Jack is also wired for ptt signal.

Tip-ptt line; ground to transmitRing-microphone audio; high- or low-impedance

input, approx 5 mV in for full power outputBarrel-common ground

Antenna (mates Rf connector (type SO-239 with Teflon insert) forwith PL-259) coaxial cable connection to antenna or linear

amplifier.

Fuse Primary power fuse (8 A for 110 V, 4 A for 220 V).

J1 Primary power connector.

Ground Stud for earth-ground connection.

AUD IN (J2) Input for 600-ohm, unbalanced line audio: 40-mV(mates with phono input produces 100-W rf output.plug)

ALC (J3) (mates Negative ALC Input signal from external powerwith phono plug) amplifier.

ANT RLY (J4) Receive contacts of internal antenna transfer relay.(mates with phonoplug) CAUTION: Do not connect linear amplifier control

to J4. Damage to the receiver may re-sult. External receiver may be connectedto J4.

(Jumpered to RCV IN (J8) if separate receiveantenna not used. Cut internal jumper if separateantenna used.)

Table 1. Controls, Indicators, Connectors, and Signal Paramete.-s (Cont).

15

ITEM FUNCTION

XVTR OUT (J5) Exciter output signal for use with transmitting con-(mates with phono verter. Level adjusted by MIC/CARRIER control.plug) Approximately 200-mW (100-mW, mln) output from

exciter into 50-ohm load. (To obtain output, con-nect this line to dc ground through a 1-mH rfchoke.)

AUD OUT (J6) Output for 600-ohm, unbalanced line audio; -10 dB(mates with phono mW at AGC threshold. Level is independent of au-plug) dio gain control.

AMP CTL (J7) Relay contacts for tr-switching external power am-(mates with phono plifier. Normally open relay contacts; contactsplug) grounded ill transmit. 2A, 28 V dc or 0.75 A, 115 V

ac capacity.

RCV IN (J8) (mates Receiver front end signal input. Bypasses antennawith phono plug) transfer relay and transmit low-pass filters.

(Jumpered to ANT RLY (J4) if separate receive an-tenna not used. Cut internal jumper if separate an-tenna used.)

PTT (J9) (mates Push-to-talk switch input. Ground to commandwith phono plug) transmit operation. (Line is connected to +5 V

through 10-kD resistor.)

KEY (J10) (mates CW key input. (Line is connected to +5 V throughwith PJ-055) 10-kD resistor.)

Tip-keying line; ground to transmitBarrel-ground

SPKR (J11) (mates Output for 4- to 8-ohm speaker. Disconnects inter-with PJ-055) nal speaker when external speaker connected. (In-

hibited when headphones connected to PHONESjack on front panel.)Tip-receiver audio; 4- to 8-D impedance, up to

4-W outputBarrel-ground

grounding

The importanceof a good ground system cannot be overem-phasized. All units of the system should have ground intercon-nections through heavy wire (#12 AWG or larger) or groundstrap (6-mm (1/4-in) wide or larger) between ground lugs. Useas short a length of ground wire or braid as practical betweenunits or external ground.

Connect the KWM-380 ground lug on the rear to a good earthor water-pipe ground.

Before using a water-pipe ground, check to make sure that noplastic, rubber, or other such insulating sections will interruptthe electrical continuity to ground. Install a jumper around anyinsulating sections found. Use heavy copper wire or groundbraid and metal pipe clamps.

antennas

The antenna is one of the most important parts in the perform-ance of any radio communications system. System perform-ance is directly related to the efficiency of the antenna. Becauseeach individual installation has unique characteristics, varioustypes of antennas, their characteristics, and installation infor-mation cannot be covered in this manual. A number of excel-lent reference works on antennas are available.

The KWM-380 is designed to operate into a nonreactive rf loadof 50 ohms. Impedance mismatches producing vswr's lowerthan 2:1 are acceptable. For vswr's 2:1 or greater, the trans-ceiver power amplifier output is automatically reduced in pro-portion to the reflected power.

16

OPERATION

introduction

Controls on the KWM-380 have been labeled so that their func-tion is self-explanatory. After referring to figures 6 and 7 andtable 1, many operators will need no further explanation. Thefollowing paragraphs summarize operation of several of thecontrols and give check lists for initial control settings for eachoperating mode.

The large tuning knob androw of switches immediatelyabove it control the trans-ceiver frequency selection.When power is applied to thetransceiver, the frequency isautomatically set to15.00000 MHz. Frequencydata is not retained in the vforegisters when power isturned off.

frequency selection

There is no need for a band-switch since selection of theMHz tuning increment per-mits tuning from 0 to 29 MHzin three turns of the knob.This rate is effective for the MHz digits only. Selecting otherincrements automatically switches the tuning rate to 200 stepsper turn. For example, selecting the 100-Hz increment gives 20kHz per revolution of the tuning knob.

TPA-1667-017

When a switch is depressed to select a frequency increment tobe changed, that and all higher increments will change as thetuning knob rotates. For example, if the 100-Hz increment isselected, the 10-Hz digit remains where last set. Rotating thetuning knob clockwise causes the 100-Hz digits to increment

17

up through 9, index the 1-kHz digit by one, and roll around to 0to continue incrementing toward 9 again. Counterclockwiserotation causes the frequency to decrement in a similar fashion.

Once a chosen frequency is selected, pressing the LOCKswitch to the in position electronically disables the tuning knoboperation. In LOCK, rotation of the tuning knob has no effect onthe frequency. To restore tuning control to the knob, press anytuning increment switch to return the LOCK switch to the outposition.

The SYNC switch is momentary and when depressed, will loadthe displayed frequency value from the operating vfo registerinto the register that is not being displayed. Fo~rexample, ifusing register B, depressing SYNC wiliload the same fre-quency into register A. The frequency in register B can then bechanged without affecting the stored value in register A.

The A and B vfo registers may contain any two frequencies.Split-frequency operation is achieved by selecting RA-TB orRB-TA. With RA-TB chosen, the transceiver will receive on thefrequency in the A register and transmit on the frequency in theB register. The frequency display shows the receive frequencywhen receiving and the transmit frequency when transmitting.

The vfo registers can be set up for split-frequency operation onany two frequencies, even within separate bands.

In CW operation, the SPOT switch enables an 800-Hz tone thatis applied to the receiver audio output. By tuning the receivedsignal so the CW audio frequency ~matchesthe 800-Hz SPOTfrequency, the receiver frequency will be matched with thetransmitted frequency.

18

FUNCTIONSWITCHES

voxOELAY

voxGAIN

FREQUENCYREAO-OUT

FREQUENCYCONTROLSWITCHES

MICPOWER

METER

METER(SWITCH)

PHONES

GAIN SELECTIVITY

TPA-1649-017

Front Panel Controls and IndicatorsFigure 6

ANTENNARF IN/OUT

AUOIOINIJ21

ALC(J3)

ANTRLY(.)4)

XVTROUT1J51

SPEAKER-(J11)

FUSE PRIMARY GROUNDPOWER(JII

AUDIO AMP RCV PTTOUT CTL IN (J9)(J6) IJ7) (Jal

KEY(J10)

TPA-1650-Q17

Rear Panel ConnectorsFigure 7

19

function switches

Depressing the MaX or VOXswitch selects manual- orvoice-operated keyingrespectively. The rear panelPTT jack (J9), whengrounded, will key the trans-mitter regardless of MaX orVOX selection.

When pressed to the in posi-tion, the MaX switch keepsthe transceiver continuously TPA-1668 -017

keyed. For normal transmit-receive operation, the MaXswitch must be out. With MaX and VOX both out, the trans-ceiver is keyed with the microphone ptt switch. Selecting VOXenables voice keying in sideband or CW keying in CW.

The AGC function can be enabled by depressing the AGCswitch. The out position inhibits AGC operation. Release timeof the AGC is controlled by the SLOW switch. The in positionselects a slow release time. This is normally used in SSB opera-tion. Fast AGC release, the switch out position, is more usefulfor CW reception.

The optional noise blanker and speech processor circuits,when installed, are selected by depressing the respective NB orPROC switch to the in position. The noise blanker reduces oreliminates pulse-type noise, such as from automobile ignitionsystems, from the receiver audio output. The speech processorincreases the ratio of average to peak power in the rf outputsignal. This increases talk power and may be desired in DXoperation.

The DELAY controls adjust the time the transceiver is held inthe transmit mode after the voice input or CW keying signal isremoved. Clockwise adjustment of either control Increases thedelay between the last input and automatic transmit-to-receiveswitching. Independently set these controls as desired for thepreferred delay times.

20

The GAIN controls adjust the sensitivity to microphone inputsignals from the operator (VOX) or from the receiver speaker(ANTI-VOX). Set the VOX GAIN so the normal voice level usedduring transmitting keeps the transceiver keyed. A level toohigh may cause background noises to key the transmitter whilea level too low will require a loud voice input to the microphonefor keying. In CW, advance VOX GAIN until an rf output isobtained when the transceiver is keyed in the VOX mode. Setthe ANTI-VOX GAIN to the minimum gain (ccw) level that pre-vents the microphone pickup of the speaker output from trip-ping the VOX circuit.

selectivity

The large (rear) BW switch ,..RCV

controls the receivebandwidth by selecting anyone of the installed filters. AFilter installation information '-)- RFis given in the following.maintenance section. The 6-kHz AM filter (AC-3813) isparticularly recommendedfor critical AM listening.

1£.,

SEe IVITYPBT-+ BW

oPT 1

The small (front) PBT controlpositions the passband of TPA-1666 - 0 17

the selected filter within the8-kHz passband of thereceiver first if and is used to select the desired sideband inreceive. For RTTY, position the pointer near LSB (left-mostposition); and for USB, between OPT 2 and OPT 3.

NOTEThe MODE switch does not determine whichsideband is received. It only selects the de-sired transmit passband.

The PBT control can shift the position of the receive selectivityby adjusting the passband above or below the normalfrequency position. In either USB or LSB, rotating the control

21

toward the vertical (OPT 1) position lowers the audio frequencypassband. This produces a lower audio tone. Figure 8 illus-trates this. Figure 9 illustrates how the passband can be tunedaway from an interfering signal to put the signal outside thepassband and eliminate the interference.

PASSBAND ASDETERM INED BYUSB FILTER

PBT CONTROLSHIFTS FILTERPASSBAND

/1ST IFPASSBAND

\OPERATINGFREQUENCY

TPA-I665-011

Filter Passband Positioning With PST ControlFigure8

PASSBANDOF USB FILTERNORMAL POSITION

USB F ILTERPASSBANDSHIFTED DOWNIN FREQUENCY

SIGNALOUTSIDEOF PASSBAND

IOPERATINGFREQUENCY

\FREQUENCY OFINTERFERINGSIGNAL

IOPERATINGFREQUENCY

\INTERFERINGSIGNAL

PST CONTROL INNORMAL POSITION

PST CONTROL CCWFROM NORMAL POSITION

TPA- 1664 -011

Passband Tuning To Eliminate Interfacing SignalFigure 9

22

mic/carrier

The MIC/CARRIER control adjusts the audio modulation levelor the CW carrier level to control the rf output power. For voiceoperation, set the METER switch to ALC. Key the transmitterand speak into the microphone or say "Ahhhh" in a normaloperating-voice level while adjusting the MIC/CARRIER controluntil the meter indicates S5 to S9 on the S-unit sgale. A morecounterclockwise position of the control will give less than thisfull power output setting.

-DO NOT EXCEED S9 alc indication or distortion may be gener-ated. Normal power output is 100 watts pep. In voice operation,this will produce an average power output of 15 to 25 watts onan average power wattmeter. Speech processing will increasethis average by several dB.

For CW operation, set the METER switch to ALC. Key the trans-mitter and adjust the MIC/CARRIER.control clockwise until themet~r indicates S5 to S9. A more counterclockwise position ofthe control will give less than this full power setting.

operating check lists

I

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IAdjustments of the KWM-380 controls will vary with individualoperators. The following check lists give initial control settingsfor each mode of operation. After setting up the transceiver, thecontrols may be adjusted as desired during operation.

If a linear power amplifier is used with KWM-380, tune theamplifier by using the CW MODE of the KWM-380. Since theCW key line is closed circuit, a key is not necessary. Simplydepress VOX or MOX for transmit enable. If a key is used, itmust be closed in VOX. The KWM-380 can be continually keyedby pressing in the MOX switch.

The rf input to the amplifier is controlled with the MIC/CAR-RIERcontrol. This control should be slowly adjusted from mini-mum power (full counterclockwise position) upward to anoutput level adequate for tuning the amplifier. There is a short

23

-..

lag between control adjustment and rf output level change. Usecaution to not overdrive the power amplifier.

For RTTY operation, the modem output (to the KWM-380 lineaudio input, J2) must be AFSK: FSK will not work.

These check lists assume that the equipment is properlyinstalled, the' microphone or CW key connected, and theDELAY and GAIN controls adjusted.

CWoperation

· Turn on POWER.

· Set MODE to CWo

· Select VFO A or B.

· Adjust RF and AF GAIN to desired levels.

· Select desired BW.

· Set PBT to midrange (vertical position).

· Select unused frequency near desired operating frequency.

· Set METER to ALC.

· Select VOX function.

· Key transceiver and adjust MIC/CARRIER for S5 to S9 ALCindication.

NOTE VOX GAIN must be set to a high enough levelto trigger the VOX circuit.

· Release key and tune to operating frequency.

24

SS B operation

· Turn on POWER.

· Set MODE to LSB or USB, as desired for band of operation.

· Select VFO A or B.

· Adjust RF and AF GAIN to desired levels.

· Select 2.2-kHz bw.

· Set PBT to between 8.0 and 2.2 (for LSB) or OPT 2.and OPT 3(for USB).

· Select unused frequency near desired operating frequency.

· Set METER to ALC.

· Press in VOX function switch if ptt operation not desired.

· Key transmitter and speak into microphone while adjustingMIC/CARRIER to power output level desired (normally tolevel where meter indicates S5 to S9 on S-unit scale). Do notexceed S9.

· Unkey and tune to operating frequency.

RTTY operation

· Make sure microphone is disconnected. (Connect AFSKRTTY signal to AUD IN.)

· Turn on POWER.

· Set MODE to LSB.

· Select VFOA or B.

25

· Adjust RF and AF GAINto desired levels.

· Select desired BWfilter for receive. (Transmit function auto-matically selects 2.2-kHz filter.)

· Set PBT to second index mark to left of top center.;'

· Set METER to ALC.

· Select unused frequency near desired operating frequency.

· Press in MOXfunction switch (transceiver keys).

· Adjust MIC/CARRIERS5 to S9 ALC indication.

· Press MOXfunction to release to out (unkeyed) position.(VOX may be used if AFSK modem mutes tone duringreceive.)

· Tune to operating frequency.

AM operation (receive only)

· Turn on POWER.

· Set MODEto AM.

· Select VFOA or B.

· Adjust RF and AFGAINto desired levels.

· Select 8.0 BW. (The operational AC-3813 6-kHz filter is rec-ommended for optimum am reception.)

· Set PBT to vertical position.

· Tune to desired frequency.

26

MAINTENANCE

Without extensive test equipment, only a limited amount ofmaintenance can be performed. The following informationguides in determining general functional areas in which adetected malfunction may be located. A multimeter, frequencycounter, power meter, dummy load, and rf voltmeter arerequired for tests.

Detailed test procedures, schematic diagrams, and parts listfor the transceiver are contained in the KWM-380TransceiverService Manual, Collins publication number 523-0769878. TheService Manual is available through authorized Rockwell-Collins Amateur Products Distributor/Service Agencies.

Unless laboratory-type test equipment is available, it is sug-gested that any malfunctioning circuit card or subassembly, orthe entire transceiver be returned to the Distributor/ServiceAgency for testing and repair.

For the names and addresses of authorized Distributor/ServiceAgencies write to:

Rockwell-CollinsCustomer Service CenterP.O. Box 4766EI Paso, Texas 79914USA

In any correspondence about the transceiver, 'give the equip-ment type number and name, Collins 10-digit part number and.serial number. This is found on the equipment nameplatelocated at the bottom center of the rear of the chassis.

Figures 10 through 14 show a block diagram, circuit card loca-tions, and cable interconnections in the KWM-380.Ifcables areremoved and replaced, make sure they are reconnected prop-erly and lead dress is restored.

27

1. POWER AMPLIFIER (AlAI)

2. RECEIVER.EXCITER (A3)

3. SPEECH PROCESSOR (A 12)(OPTION)

4. POWE R SUPPL YCONTROL (A9AI)

5. +24 V REGULATOR(A9A2)

6. NOISE BLANKER (All)(OPTION)

7. DrSPLA Y (A lOA 1)

B. SYNTHESIZER (A5)

9. OSCILLATOR (A7)

10. CONTROL CARD (AB)

11. PASS BAND TUNING (A4)

12. PASS BAND TUNING (AI3)(OPTION)

13. LOW PASS FILTER (A2)

TPA-3002-o19

I

r

Circuit Card LocationsFigure 11

30

r-' 2-

I @f I ._---I

o I _3

13

12

O.11

...-.... --.... 4-10

69

- --B

replaceable fuses and lamps

Primary power (located on rear panel) - 8 A, AGC for 100 V; 4A, AGC for 220 V; -30A, AGC for dc operation (under powerstrapping cover plate).

r 14-volt supply (two fuses located on power supply card underchassis) - 2 A, AGC.

I.Panel meter lamps (wired into holder at top rear of meter) - T13/4, 14 V, 100 mA, type 7373.

c:

31

1

~JUMPERn :JIO

JUMPER ~JI

Cl:TAll...

(J J28J2'

J2'

.,,,

BLK-J1-1/,",'-JI-3

I'IHT-R68.,BRN-R68-29\j(-R68-3

AIOFRONT PANEL

DETAIL AWITH AI2 INSTALLED, J26-J28ARE CONNECT£O AS SHOWN HERE

.12J28P2.

Shielded Wire Wiring DiagramFigure14

36

1

A9 CHASSIS

A3RECEIVEREXCITER

Bu<'""

J31BU<

~:\r=

~33'""BRN

BRN

AIZSPEECHPROCESSOR

(RED)

TPA-3005-QI4

....

1IWHT)A.12J26P2'

(SUO

'0 ...

receiver-exciter sidetone and spot potentiometer. adjustments

Refer to figure 15 for locations of sidetone frequency and leveland spot tone level potentiometers. These potentiometers maybe adjusted to the level or frequency desired by the operator.

'....I

.,DO NOT MAKE ANY OTHER ADJUSTMENTS ON THERECEIVER-EXCITER BOARD WITHOUT THE INSTRUCTIONSAND TEST EQUIPMENT SETUP GIVEN IN THE KWM-380 SER-VICE MANUAL.

39.6 MHz and 455 kHz oscillator adjustments

The oscillator frequencies are adjustable over a limited range.The oscillators do not normally need adjusting, however thetrimmer capacitors are readily accessible if adjustment isrequired. No test equipment is necessary.

The test for off-frequency operation and corrective adjustmentprocedures are as follows:

· Set MODE to USB.

· Set BW to 8.0 and PBT to vertical (OPT 1) position.

· Tune WWV at 15.00000 MHz.

· Adjust dial frequency for exact zero-beat of station.

· Note dial frequency offset, if any....

iI

· Repeat operation for 10.00000 MHz and 5.00000 MHz, not-ing frequency offset.

· If frequency offset is the same for each frequency, the 455-kHz oscillator needs adjusting. If offsets differ, the 39.6-MHzoscillator needs adjusting.

· To adjust either oscillator, tune WWV at 15.00000 MHz. Setdial frequency to 15.00000 MHz. Adjust the appropriateoscillator trimmer capacitor for zero-beat. (Refer to figure 16for capacitor access hole location.)

37

· Recheck frequency offsets, as above. If both oscillators areoff frequency, these steps may have to be repeated severaltimes.

EXCITERRF OUT

J1

1ST MIXINJECT

J2

NOISEBLANKERJUMPER

R921SIDETON EFREQ

J10 J11455 454.2kHz kHz

R616SIDETONELVL

R615SPOTTONELVL

TPA-1683-o19

Receiver-Exciter Connector and Adjustments LocationsFigure 15

38

455 kHz OSCTRIMMER CAPACCESS HOLE

39.6 MHz OSCTRIMMER CAPACCESS HOLE

II

~

LEFT SIDE VIEW

TPA-1964-019

Oscillator Trimmer Capacitor Adjustment Hole LocationFigure 16

general troubleshooting

de voltages

Figure 17 shows the power supply input and output voltages.These should be checked along with other checks for any mal-function. Other than fuse replacement, repair should not beattempted without information in the Service Manual.

r I

39

+14 V INPUT TO +24 V REGULATOR IS ATFEEDTHRU CAPACITOR NEAREST BOTH THESHIELDING COVER AND FRONT PANEL.

+24 V OUTPUT FROM SHIELDED CIRCUIT ADJACENTTO POWER SUPPLY BOARD IS AT FEEDTHRUCAPACITOR NEAREST SHIELDING COVER ANDFARTHEST FROM FRONT PANEL.

40

TPA-3017-Q11

Power Supply Input/Output VoltageFigure 17

$I

SER PASS XSTR DRIVE+17 V (INPUT FROM RECTI

GND (THRU HEAT SINK THERM SW)

+14 V (INPUT FROM SER PASS XSTR)PWRGND

+14 V (THRU F2 TO AUDIO PAl+14 V (INPUT FROM SER PASS XSTR)+14 V (OUT THRU F1)

+9 V (OUT)

;1 On

G

o SIG

H

o GND

.: I +5V (OUT)

$0 01

oscillator (fixed-frequencies) and synthesizer(variable-frequency) outputs

Refer to figure 15 for oscillator and synthesizer signal connec-tor locations on the receiver-exciter board. Make the followingmeasurements with an rf voltmeter and frequency counter. Ifthe fixed-frequency signals are not correct, the oscillator ismalfunctioning. If the variable-frequency signal is not correct,the synthesizer or control card is malfunctioning. Refer to theService Manual or contact a Distributor/Service Agency forrepair.

39.60000 MHz (J3) in receive or transmit - approx 0.5 V rmsacross 50 0

455 kHz (J10) in sse receive - greater than 50 mV rms across500

454.2 kHz (J11) in CW receive - greater than 50 mV rmsacross 50 0

1st mixer injection (J2) in receive or transmit; 39.145 MHz for00.00000 MHz dial frequency thru 69.144 99 MHz for 29.999 99MHz dial frequency - approx 0.5 V rms across 50 0

Rapid beeping in the speaker indicates the synthesizer isunlocked. This may be caused either by a faulty 5-, 9-, or 24-Vpower supply output, or by a malfunction in the synthesizer.Check the power supply outputs first, then check the coaxcable between the synthesizer and oscillator. Check the oscilla-tor and synthesizer output levels for values indicated above. Ifall these are correct, the synthesizer is malfunctioning.

receiver Ilow pass filter

If there is no audio output, check F1, F2, and the +14-V outputsat the power supply. If these are not faulty, check the oscillatorand synthesizer outputs. If these are not faulty, the receivercircuits are malfunctioning. Refer to the Service Manual or con-tact a Distributor/Service Agency for repair.

41

If the audio output is weaker than expected for a known inputsignal, connect the antenna to the RCV IN jack on the trans-ceiver rear panel (to bypass the low-pass filter). If the audiooutput becomes normal, the low-pass filter or control card ismalfunctioning. If the output remains weak, the receiver circuitsare malfunctioning. Refer to the Service Manual or contact aDistributor/Service Agency for repair.

exciter

Refer to figure 15 for the exciter rf output connector on thereceiver-exciter board. Disconnect cable from J1. Set theMODE to CW, MIC/CARRIER to full maximum (clockwise posi-tion), and depress MOX. Measure the exciter output (at J1) withan rf voltmeter and frequency counter. The level should beapproximately 3 V rms across 50 n and the frequency the sameas the dial frequency. If the output is not correct, refer to theService Manual or contact a Distributor/Service Agency forrepair. (Switch off MOX and reconnect cable at J1 when test iscomplete.)

power amplifier/low pass filter

Connect an rf power meter and dummy load to the transceiverrf connector. Set the MODE to CW and MIC/CARRIER to fullmaximum (clockwise position). In measuring rf power in thefollowing steps note that, unless the AC-2808 Blower Kit isinstalled, the output will decrease to about half power within 30seconds after the MOX switch is turned on. Read the powermeter before the power decrease.

Measure the power amplifier output by tuning to a valid trans-mit frequency, switching on MOX, measuring the power, thenswitching off MOX. Make a power measurement in each of thebands. If the output power is less than approximately 100 wattsin all of the bands, the malfunction is probably in the poweramplifier. If one or more of the bands show full output power,the malfunction is probably in the low-pass filter or controlcard. Refer to the Service Manual or contact a Distributor/Service Agency for repair.

42

bandwidth (crystal) filter installation

..,

The AC-3810 through AC-3813 Filter Kits may be installed indi-vidually or as a group to provide additional bandwidth selectiv-ity in the KWM-380. Except for the AC-3813 (AM Filter), thefilters may be installed in any of the positions on the Pass BandTuning or Pass Band Tuning Option card. Figures 18 and 19,and table 2 show the positions and list the BW SELECTIVITYswitch position that enables the filter installed in that associatedposition. For operating convenience, it is suggested that thefilters be installed in order of decreasing bandwidth.

.-"

To install a filter, remove the appropriate circuit card, placemica washers (supplied with the filter kit) on the filter terminals,then position the filter on the circuit card. Secure the filter withthe supplied flat washers, lockwashers, and hexnuts (also sup-plied with the kit). Solder the filter terminals to the circuit padson the card.

Before installing the AC-3813 AM Filter, the existing piggy-backcircuit board filter must be removed from the Pass Band Tun-ing card. Remove the mounting hardware from the board andunsolder the pins from the circuit pads on the card. Mount theAM filter as described for the other filters.

-.

TPA.2213'()19

Pass Band Tuning Card Filter LocationsFigure 18

43

§"V" v I::::: :: . :: I

0 AC-3813 0 JI6.0 kHz

EJ

AM FILTER44 CIRCUIT CARD

0 012.1 k.H STANDARDSSB FILTERI

1°

OPT2 FilTER

°1 B

,

<:4 RF. OUTJI

RF-IN<:4

OPT 3 FIL TEA

o o

OPT 1 FILTER

o oA13 CIRCUIT CARD

TPA.2214.Q19

Pass Band Tuning Option Card Filter LocationsFigure 19

Table 2. BW SELECTIVITY Switch and Filter PositionRelationships.

1

44

BW SELECTIVITY FILTER POSITIONSWITCH POSITION ON CIRCUIT CARD

8.0 A4 card upper position2.2 A4 card middle positionOPT 1 A13 card lower positionOPT 2 A4 card lower positionOPT 3 A13 card upper position

ACCESSORIES

TYPE ANDPART NUMBER DESCRIPTION

,.,

LAC-3801 Noise Blanker641-7105-001 (For use in transceivers located in high

impulse type rf noise environments)

AC-3802 Speech Processor642-2438-001 (A processor that is inserted in the

audio circuit path to increase theaverage "talk-power" in SSBtransmission)

AC-3803 Control Interface641-7150-001 (Provides control interface assembly

within transceiver. Allows use ofexternal key pad (not supplied) forfrequency control)

AC-3810 360-Hz CW Filter642-2439-001 (Carrier-centered, 360-Hz bandwidth

filter at -3-dB points; 1250 Hz at -60dB)

AC-3811 140-Hz CW Filter642-2440-001 (Carrier-centered, 140-Hz bandwidth

filter at -3-dB points; 600 Hz at -60 dB)..,.

AC-3812 1.7-kHz Narrow Sideband Filter622-2441-001 (Carrier-centered, 1.7-kHz bandwidth at

-3-dB points; 3.4 kHz at -60 dB)

AC-3813 6.0-kHz AM Filter642-2442-001 (Provides overall receive selectivity of

6-kHz bandwidth at -3-dB points; 25kHz at -60 dB. This filter recommendedin place of supplied AM filter if criticalAM listening is planned.)

45

TYPE ANDPART NUMBER

AC-2801622-3537-001

AC-2808622-3547-001

AC-2821622-3564-001

MM-280020-0260-010

MM-281020-0260-020

SM-280020-0261-010

SM-281020-0261-020

46

DESCRIPTION

Rack Mount(Used for mounting transceiver instandard 19-in racks or cabinets)

Blower Kit(Used to enable operation atcontinuous 100-watt power output; acpower from transceiver. Recommendedfor RTTY operation. Not usually neededfor voice or cw.)

DC Standby Power Cable(2-metre (6.5-foot) dc power cable foruse with transceiver for emergencyoperation from 12-V battery; includesradio power connector, battery clamps,:md installation instructions)

Microphone, Handheld(Handheld dynamic omnidirectionalmicrophone with low impedance; haspush-to-talk switch; color, black)

Microphone, Handheld(Handheld dynamic microphone withlow impedance and noise-cancellingcharacteristics; has push-to-talk switch;color, black)

Microphone, Desktop(Desktop dynamic microphone with lowimpedance and cardioid sound pattern;has push-to-talk bar; color, black)

Microphone, Desktop(Desktop dynamic microphone with lowimpedance and noise-cancellingcharacteristic; has push-to-talk bar pluscontinuous-key switch; color, black)

TYPE ANDPART NUMBER

AC-2827634-8545-001

AC-2828634-8546-001

AC-2829622-3571-001

AC-2830622-3572-001

Q

DESCRIPTION

Key, CW(Hand-operated CW key)

Microphone Foot Switch(Foot switch for hands-free keying ofmicrophone)

Headphones, Standard(Standard headphones with 600-ohmimpedance; has sound-blockingearmuffs)

Headphones(Lightweight headphones with 500-ohmimpedance; has comfort-designedearpieces)

47/48

AMATEUR EQUIPMENT LIMITEDWARRANTY

Rockwell-Collins agrees to repair or replace, without charge andwithin a reasonable period, any equipment, parts, or accessorieswhich are defective as to design, workmanship or material and whichare returned to Rockwell-Collinsat its factory, or its designated Ser-vice Agency, transportation prepaid, provided:

(a) Buyer presents a properly executed Warranty VerificationCertificate.

(b) Notice of the claimed defect is given Rockwell-Collinsor anauthorized Service Agency, or authorized Distributor, in writ-ing, within 1 year from the date of purchase and goods arereturned in accordance with Rockwell-Collins instructions.

(c) Any failure due to use of equipment for purposes other thanthose contemplated in normal amateur operations or in viola-tion of Rockwell-Collinsapplicable Instruction Book shall notbe deemed a defect within the meaning of these provisions.

This Warranty is void with respect to equipment which is altered, mod-ified or repaired by other than Rockwell-Collinsor a Rockwell-CollinsAuthorized Service Agency. However, alternation or modification inaccordance with Rockwell-CollinsService Bulletins shall not affect thisWarranty.

The foregoing shall constitute the Buyer's sole right and remedy underthis guarantee. IN NO EVENTSHALL ROCKWELL-COLLINSHAVEANYLIABILITYFOR INCIDENTALOR CONSEQUENTIALDAMAGES,OR FOR LOSS, DAMAGEOR EXPENSEDIRECTLYOR INDIRECTLYARISINGFROM THE USE OF THE PRODUCTS,OR ANYINABILITYTO USE THEM EITHERSEPARATELYOR IN COMBINATIONWITHOTHER EQUIPMENT OR MATERIALS OR FROM ANY OTHERCAUSE.(Some states do not allow limitations on how long an impliedwarranty lasts or the exclusion or limitation of incidental or conse-quential damages, so the above limitations or exclusions may notapply to you.)

This Warranty gives you specific legal rights, and you may also haveother rights which vary from state to state.

IMPORTANT: The Amateur Equipment Warranty Verifica-tion Certificate must be completed by selleron date of delivery of new equipment.

Unauthorized modification to the equip-ment voids this warranty.

Collins Telecommunications Products Division. Rockwell InternationalCedar Rapids. Iowa 52406

Rockwell International

Collins TelecommunicationsProducts Division

Electronic Systems Group

523-0769877-002217 10-80 Printed in U.S.A.